A self-cleaning device for power distribution cabinet filter screen

Abstract

The application discloses a self-cleaning device for a power distribution cabinet filter screen, comprising: at least one cleaning head, which is arranged on the leeward side of the power distribution cabinet filter screen and is in contact with or has a preset gap from the surface of the filter screen; a driving mechanism, which is in transmission connection with the cleaning head and is used for driving the cleaning head to make reciprocating motion along the surface of the filter screen; and a positive pressure assembly, which is in communication with the cleaning head and is used for providing high-pressure airflow to the cleaning head; a first air outlet is arranged on the cleaning head, and when the cleaning head moves along the surface of the filter screen, the first air outlet sprays high-pressure airflow to the leeward side of the filter screen, so that the adhesion on the windward side of the filter screen is blown away in the opposite direction. The self-cleaning device for the power distribution cabinet filter screen is arranged on the back side of the filter screen and does not affect ventilation, the cleaning head moves reciprocally to clean the whole area, and the reverse blowing improves the cleaning effect on the filter screen.

Description

Technical Field

[0001] This invention relates to the field of electrical distribution cabinet protection technology, specifically to a self-cleaning device for electrical distribution cabinet filters. Background Technology

[0002] Distribution cabinets are commonly used complete sets of equipment in power distribution systems. The electrical components inside the cabinet generate heat during operation, and are usually equipped with exhaust fans in conjunction with air inlets on the side walls of the cabinet to create forced convection cooling. Filters are installed at the air inlets to prevent environmental dust and fibrous materials from entering the cabinet with the incoming air. After long-term service, dust and fibrous materials accumulate on the windward side of the filter and block the mesh, reducing the ventilation cross-sectional area and causing a decrease in air intake. This worsens the heat dissipation conditions inside the cabinet, making electrical components prone to overheating and failure.

[0003] Existing filter self-cleaning solutions mainly include two types: The first type involves manual removal of the filter for offline cleaning, requiring equipment shutdown and power outage, resulting in low maintenance efficiency and high labor costs; the second type places the blowing component on the windward side of the filter, relying on a fan to blow air in the forward direction to flush the filter. However, the blowing airflow easily forces dirt into the filter's pores, leading to incomplete cleaning; another type uses a fixed-point jet structure, which limits the blowing range and cannot achieve full-area cleaning of the filter. Current technologies lack a solution for deploying a reciprocating blowing head on the leeward side of the filter and using reverse high-pressure jetting from the back to the windward side, resulting in unsatisfactory overall self-cleaning performance. Summary of the Invention

[0004] To overcome the above-mentioned shortcomings in the prior art, the present invention provides a self-cleaning device for a power distribution cabinet filter, which is located on the back side of the filter without affecting ventilation, and whose cleaning head moves back and forth to clean the entire area, and whose reverse blowing improves the cleaning effect on the filter.

[0005] The technical solution of this invention is as follows: A self-cleaning device for a power distribution cabinet filter includes: At least one cleaning head is provided, which is located on the leeward side of the filter screen of the power distribution cabinet and maintains a preset gap or contact with the surface of the filter screen. A drive mechanism is connected to the cleaning head and is used to drive the cleaning head to reciprocate along the surface of the filter screen. A positive pressure component, connected to the cleaning head, is used to provide a high-pressure airflow to the cleaning head; The cleaning head is provided with a first air outlet. When the cleaning head moves along the surface of the filter screen, the first air outlet sprays high-pressure airflow onto the leeward side of the filter screen, causing the adhering substances on the windward side of the filter screen to be blown away in the opposite direction.

[0006] Preferably, the cleaning head has a flexible sealing element on the side facing the filter screen, and the flexible sealing element surrounds and forms a blowing chamber, and the airflow blown out from each of the first air outlets blows into the blowing chamber.

[0007] In any of the above embodiments, it is preferred that the cleaning head has an inner cavity, an inner core is floatingly nested in the inner cavity, and a second air outlet is provided in the inner core to cooperate with the first air outlet on the cleaning head; During the movement of the cleaning head along the filter, the inner core undergoes axial displacement relative to the cleaning head, causing the second air outlet to intermittently align with the first air outlet, thereby changing the effective jet cross-sectional area of ​​the airflow and generating pulsed airflow impact.

[0008] In any of the above embodiments, it is preferred that the first air outlet and the second air outlet on the inner core are both mutually cooperating spaced pore structures.

[0009] In any of the above embodiments, it is preferred that the inner core and the guide groove of the drive mechanism form a guiding and limiting structure, and during the movement of the cleaning head, the inner core, due to its limiting effect, generates a reciprocating displacement along the axis of the cleaning head.

[0010] In any of the above embodiments, it is preferred that the guide limiting structure includes limiting teeth disposed at the guide groove; One end of the inner core is connected to the cleaning head via an elastic element, and the other end extends to the outside of the cleaning body and abuts against the limiting teeth.

[0011] In any of the above solutions, it is preferred that the limiting tooth and the guide groove slide together, and when the cleaning head moves, the inner core acts on the limiting tooth so that the limiting tooth is located at one end in the forward direction of the cleaning head and abuts against the guide groove.

[0012] In any of the above embodiments, the positive pressure component preferably includes a fan or air pump, and a guide pipe connected between the fan or air pump and the cleaning head.

[0013] In any of the above solutions, it is preferred that the driving mechanism is a linear push rod.

[0014] In any of the above solutions, it is preferred that the flexible seal is made of rubber or felt.

[0015] The self-cleaning device for the distribution cabinet filter of the present invention has a cleaning head arranged on the leeward side of the filter, and the overall installation does not occupy the air intake channel, so it does not interfere with the normal ventilation of the cabinet; the drive mechanism drives the cleaning head to move back and forth along the filter, covering the entire area of ​​the filter, thereby realizing full-area cleaning of the filter; the positive pressure component sprays air in the opposite direction from the back of the filter through the cleaning head, and the airflow penetrates the mesh to peel off the adhering objects on the windward side, ultimately greatly improving the cleaning effect of the filter. Attached Figure Description

[0016] Figure 1This is a schematic diagram of an embodiment of the self-cleaning device for the distribution cabinet filter of the present invention installed on the leeward side of the distribution cabinet filter.

[0017] Figure 2 This is a schematic diagram of an embodiment of the self-cleaning device for the distribution cabinet filter of the present invention, showing the cooperation between the cleaning head and the guide groove.

[0018] Figure 3 This is a schematic diagram of an optional embodiment of the cleaning head of the self-cleaning device for the distribution cabinet filter of the present invention.

[0019] Figure 4 This is a schematic diagram of another optional embodiment of the cleaning head of the self-cleaning device for the distribution cabinet filter of the present invention.

[0020] Figure 5 for Figure 4 Exploded view of the embodiment shown.

[0021] Figure 6 This is a schematic diagram of a preferred embodiment of the self-cleaning device for the distribution cabinet filter of the present invention, showing the cooperation between the limiting teeth and the guide groove.

[0022] Figure 7 for Figure 6 Exploded view of the embodiment shown.

[0023] Explanation of the labels in the diagram: 101-Cleaning head; 102-Linear push rod; 103-Filter screen; 104-Guide groove; 105-Distribution cabinet; 106-Guide pipe; 107-Slide groove; 108-Limiting teeth; 109-Clamping plate; 110-Slider; 111-First air outlet; 112-Adjusting block; 113-Inner core; 114-Second air outlet; 115-Support frame; 116-Elastic element; 117-Flexible sealing element; 118-Guide rod; 119-Oval hole. Detailed Implementation

[0024] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] Example 1: This embodiment discloses a self-cleaning device for a power distribution cabinet filter. The device is arranged inside the power distribution cabinet and is installed on the leeward side of the side wall filter of the power distribution cabinet 105.

[0027] like Figure 1 , 2 As shown, to ensure stable movement of the cleaning head 101 on the surface of the filter 103, two guide grooves 104 are symmetrically installed on both sides of the filter mounting port inside the distribution cabinet 105. The two guide grooves 104 are rigidly fixed to the sheet metal surface of the inner wall of the distribution cabinet 105 by bolts, and their effective vertical length completely covers the stroke of the cleaning head 101. Recessed sliding grooves 107 are provided on the inner sidewalls of the two guide grooves 104 facing each other. The sliding grooves 107, along the length of the guide grooves 104, provide guidance and constraint for the sliding displacement of the cleaning head 101.

[0028] Each guide groove 104 is equipped with a detachable clamp 109 on its upper part, which is fixed to the upper part of the guide groove 104 by bolts. The left and right ends of the cleaning head 101 are equipped with sliders 110 that are compatible with the specifications of the slide groove 107. During assembly, the two guide grooves 104 are first installed in corresponding positions inside the distribution cabinet 105. Then, the sliders 110 at both ends of the cleaning head 101 are placed into the slide groove 107. After the sliders 110 are installed in the slide groove 107, the clamps 109 are locked to the upper part of the guide groove 104 to limit the sliders 110 and prevent them from coming out of the slide groove 107.

[0029] The end face of the cleaning head 101 facing the filter 103 and the leeward side of the filter 103 are arranged with a small pre-set gap, taking into account the pore size of the filter 103 and the amount of dust accumulated on the windward side of the filter 103 under normal operating conditions. Alternatively, a close-fitting arrangement can be used. Several evenly arranged first air outlets 111 are opened on the end face of the cleaning head 101 facing the filter 103. The first air outlets 111 are completely connected to the inner cavity of the cleaning head 101 and are used for directional jetting of high-pressure purging airflow.

[0030] In this embodiment, the positive pressure component provides positive pressure to the cleaning head 101. Specifically, the positive pressure component includes a fan or an air pump. The selection of the fan or air pump is based on the pore size of the filter screen 103. When the pore size of the filter screen 103 is large (e.g., when stainless steel wire mesh with a mesh count below 200 is used), the resistance is small when blowing away impurities accumulated on the windward side of the filter screen 103, so a fan can be used as the positive pressure component. When the pore size of the filter screen 103 is small (e.g., when non-woven fabric filter screen is used, or when stainless steel filter screen with a mesh count above 200 is used), the resistance is large when blowing away impurities accumulated on the windward side of the filter screen 103, so an air pump can be used as the positive pressure component. The fan or air pump is connected to the hollow inner cavity of the cleaning head 101 through the guide pipe 106.

[0031] In this embodiment, as Figure 1 As shown, the drive mechanism uses a linear push rod 102. The fixed end of the linear push rod 102 is rigidly connected to the inner wall of the cabinet, and the telescopic movable end of the linear push rod 102 is fixedly connected to the cleaning head 101. Under the constraint of the two guide grooves 104, the cleaning head 101 can blow the filter screen 103 by the telescopic drive of the linear push rod 102.

[0032] This device is equipped with a control unit that integrates time-sequenced start-stop control, enabling fully automatic periodic dust removal operations. Specifically, the control unit has multiple I / O interfaces, and the linear actuator 102 of the drive mechanism is electrically connected to the corresponding I / O interface of the control unit. The linear actuator 102 can be a motor-driven linear actuator, as this type of linear actuator has a built-in limit function. Therefore, the control unit can control the running direction and range of the linear actuator 102 based on the position feedback of the linear actuator 102.

[0033] If the positive pressure component uses a fan, the control unit controls the fan's start and stop via a relay according to the preset cleaning cycle. Under normal cooling conditions, the fan is in standby mode. After the dust cleaning program is triggered, the control unit directly outputs a switch signal to start the fan, continuously outputting a constant cleaning airflow.

[0034] If the positive pressure component uses an air pump, a solenoid valve is installed in series on the guide pipe 106. The control unit controls the solenoid valve to open and close the air path. Before the dust removal operation starts, the solenoid valve is in the closed state, and the air path is cut off with no airflow output. After the dust removal program is triggered, the control unit controls the solenoid valve to open, the high-pressure air path is opened, and the high-pressure airflow is quickly introduced into the inner cavity of the cleaning head 101 through the guide pipe 106.

[0035] During the cleaning operation of filter 103, high-pressure airflow is directed from the first air outlet 111 of cleaning head 101 to the leeward side of filter 103. The airflow penetrates the filter 103 mesh and impacts the dust, catkins, fibers, and other adhering substances that have been adsorbed and accumulated on the windward side of filter 103 under negative pressure for a long time. The reverse wind pressure breaks the adsorption state of the dust, causing the adhering substances to fall off. At the same time, linear push rod 102 continuously drives cleaning head 101 to slide back and forth at a uniform speed along the entire area of ​​filter 103. With the continuous output of blowing airflow, the automatic dust removal operation of filter 103 is completed without dead angles and with full coverage. After the dust removal is completed, each component resets in sequence and stands by, waiting for the next cleaning cycle.

[0036] High-pressure airflow penetrates the filter screen 103 and blows in the opposite direction from the leeward side to the windward side of the filter screen 103. This reverse airflow impacts the dust, catkins, fibrous debris, and other adhering substances that have accumulated on the windward side of the filter screen 103 due to long-term negative pressure adsorption, causing stubborn adhering substances to detach from the filter screen 103 and be removed. During the blowing operation, the linear push rod 102 continuously drives the cleaning head 101 to move up and down at a uniform speed along the surface of the filter screen 103, achieving thorough cleaning without dead angles.

[0037] Example 2: Based on Example 1, such as Figure 3 As shown, when the cleaning head 101 and the filter screen 103 maintain a preset gap on the leeward side, a flexible sealing element 117 is provided on the side of the cleaning head 101 facing the filter screen 103. This flexible sealing element 117 is used to direct the high-pressure gas ejected from the first air outlet 111 to the surface of the filter screen 103 to be cleaned. By providing a flexible sealing element 117 on the outside of the first air outlet 111, the space around the first air outlet 111 can be effectively blocked, preventing the high-pressure airflow from dissipating outward through the gap between the cleaning head 101 and the filter screen 103. This allows the high-pressure airflow to be concentrated and directed onto the leeward side of the filter screen 103, ensuring the concentration of air pressure during reverse cleaning and improving the removal effect of the deposits on the filter screen 103.

[0038] In this embodiment, the flexible seal 117 is made of rubber or felt. This type of material has good flexibility and enclosure stability, and can continuously and stably achieve the functions of airflow directional guidance and anti-spillage during the reciprocating motion of the cleaning head 101 along the surface of the filter screen 103 with the drive mechanism, ensuring the long-term stable self-cleaning operation of the device.

[0039] Example 3: Based on Example 1 or 2, to compensate for the drawback of the weak penetration of the constant blowing airflow of the cleaning head 101, such as... Figure 4 , 5As shown, the cleaning head 101 has a hollow inner cavity with a reasonable assembly gap. The inner core 113 is assembled inside the inner cavity in a floating nesting manner, and the inner core 113 can slide back and forth along the length of the cleaning head 101. Multiple second air outlets 114 are evenly distributed along the length of the inner core 113, and each second air outlet 114 mates with a first air outlet 111 on the end face of the cleaning head 101 facing the filter screen 103. The opening size and hole spacing of the second air outlets 114 and the first air outlets 111 are consistent, forming a mutually matched spaced pore structure. When the linear push rod 102 drives the cleaning head 101 to reciprocate along the surface of the filter screen 103, the inner core 113 is driven by the external limiting structure to undergo lateral displacement relative to the cleaning head 101, resulting in intermittent alignment and misalignment of the second air outlets 114 and the first air outlets 111. When the two sets of holes overlap and are connected, the high-pressure gas inside the cavity is smoothly sprayed from the first air outlet 111 onto the leeward side of the filter screen 103. When the holes are misaligned and block each other, the airflow passage is blocked. By continuously changing the effective spray cross-sectional area of ​​the airflow, intermittent air supply is generated to create a pulsating impact airflow. This enhances the removal effect on impurities attached to the filter screen 103.

[0040] In this embodiment, as Figure 2 , 4 As shown in Figure 5, the inner core 113, in cooperation with the guide groove 104 that matches the drive mechanism, forms a guiding and limiting structure. This guiding and limiting structure preferably adopts a configuration of limiting teeth 108. One end of the inner core 113 is provided with an adjusting block 112. Specifically, the cooperation relationship between the limiting teeth 108 and the guide groove 104 is as follows: the limiting teeth 108 are installed at the bottom opening of the slide groove 107 of the guide groove 104. After the limiting teeth 108 and the opening are assembled, the height of the limiting teeth 108 should be lower than the height of the slide groove 107 to prevent interference from the limiting teeth 108 causing the slider 110 at the cleaning head 101 to slide along the slide groove 107.

[0041] In this embodiment, as Figure 5 As shown, an elastic element 116 is installed at the other end of the inner core 113. The other end of the elastic element 116 abuts against the side wall of the inner cavity of the cleaning head 101. The end of the inner core 113 away from the elastic element 116 extends out of the other end of the cleaning head 101. The adjusting block 112 at this end always maintains abutment contact with the tooth surface of the limiting tooth 108. During the movement of the cleaning head 101 as a whole with the drive mechanism, the adjusting block 112 at the end of the inner core 113 continuously presses against the limiting tooth 108. When the adjusting block 112 at the end of the inner core 113 moves between the tooth tip and tooth bottom of the limiting tooth 108, each of the second air outlets 114 and the first air outlet 111 will be misaligned and closed at least once to cut off the air passage, and will be aligned at least once to fully open the air passage.

[0042] A preferred radial limiting assembly method for the inner core 113 is as follows: Multiple rod-shaped support frames are spot-welded to the body of the inner core 113. Adjacent support rods are connected by cubic connecting seats. The ends of the support rods that slide against the inner wall of the cleaning head 101 are machined and polished to form arc-shaped end faces to reduce friction during movement. All arc-shaped ends are simultaneously pressed against the inner wall of the cleaning head 101, relying on multi-point support to form radial constraints on the inner core 113, preventing vertical displacement and radial movement of the inner core 113 within the cavity, and accurately ensuring the alignment and fit accuracy between the second air outlet 114 and the first air outlet 111. Simultaneously, the cleaning head 101 preferably adopts a split-shell structure, consisting of two shells joined together, with the mating edges of the two shells integrally formed with outwardly extending connecting ears. In the assembly process, the inner core 113, elastic element 116, and support frame 115 are first pre-installed and fixed in the inner cavity of one side of the shell, and then the other side of the shell is fastened and locked with bolts through the connecting lugs.

[0043] Example 4: In embodiment 3, when the limiting tooth 108 is fixedly assembled at the slot of the slide opened in the guide groove 104, when the linear push rod 102 drives the cleaning head 101 to pass the same position of the filter screen 103 in both upward and downward directions, the offset size of the inner core 113 caused by the limiting tooth 108 is exactly the same. The air gap formed by each second air outlet 114 of the inner core 113 and the first air outlet 111 of the cleaning head 101 remains uniform, the flow rate of the blowing air is constant, and the airflow of a single force is difficult to break the stubborn dust embedded in the gap of the filter screen 103.

[0044] like Figure 6 , 7 As shown, to improve the above-mentioned defects and achieve the design goal of differentiating the purging and ventilation gaps when the cleaning head 101 passes through the same position during its upward and downward movements, the limiting tooth 108 and the guide groove 104 are assembled using a sliding fit. Simultaneously, the effective sliding stroke of the limiting tooth 108 within the slide groove is limited to half the length of a single tooth. When the cleaning head 101 moves and cleans in any direction, the end of the inner core 113 continuously abuts against the limiting tooth 108, forcing the limiting tooth 108 to press against the end of the groove on the side of the cleaning head 101's forward direction. After the cleaning head 101 reverses direction, the end of the inner core 113 pushes the limiting tooth 108 from the other side, causing it to slide along the slide groove by half the tooth length and fit against the end of the groove in the reverse forward direction. Based on the positional offset generated by the limiting teeth 108, when the cleaning head 101 moves up or down to the same position, the air gap formed by the second air outlet 114 of the inner core 113 and the first air outlet 111 at the cleaning head 101 is inconsistent. The two purgings form pulse airflows with different air volumes, which repeatedly disturb the dust accumulated on the filter screen 103 by alternating impact, greatly improving the ability to remove deep dust.

[0045] In this embodiment, as Figure 6 , 7 As shown, in order to better limit the tooth 108 at the opening of the guide groove 104, and at the same time ensure the sliding of the tooth 108 at the opening, the tooth 108 is provided with an oval hole 119 and the opening is provided with a guide rod 118.

[0046] The above-described embodiments are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A self-cleaning device for a power distribution cabinet filter, characterized in that, include: At least one cleaning head (101) is provided on the leeward side of the filter screen of the power distribution cabinet and maintains a preset gap or contact with the surface of the filter screen (103); The drive mechanism is connected to the cleaning head (101) for driving the cleaning head (101) to reciprocate along the surface of the filter screen (103); A positive pressure component, connected to the cleaning head (101), is used to provide a high-pressure airflow to the cleaning head (101); The cleaning head (101) is provided with a first air outlet (111). When the cleaning head (101) moves along the surface of the filter screen (103), the first air outlet (111) sprays high-pressure airflow onto the leeward side of the filter screen (103), causing the adhering material attached to the windward side of the filter screen (103) to be blown away in the opposite direction.

2. The self-cleaning device for the distribution cabinet filter as described in claim 1, characterized in that, The cleaning head (101) is provided with a flexible seal (117) on the side facing the filter (103). The flexible seal (117) surrounds and forms a blowing chamber, and the airflow blown out from each of the first air outlets (111) blows into the blowing chamber.

3. The self-cleaning device for the distribution cabinet filter as described in claim 2, characterized in that, The cleaning head (101) has an inner cavity, in which an inner core (113) is floatingly nested. The inner core (113) is provided with a second air outlet (114) that cooperates with the first air outlet (111) on the cleaning head (101). During the movement of the cleaning head (101) along the filter screen (103), the inner core (113) is axially displaced relative to the cleaning head (101), so that the second air outlet (114) and the first air outlet (111) are intermittently aligned, thereby changing the effective jet cross-sectional area of ​​the airflow and generating pulsed airflow impact.

4. The self-cleaning device for the distribution cabinet filter as described in claim 3, characterized in that, The first air outlet (111) and the second air outlet (114) on the inner core (113) are both interlocking pore structures.

5. The self-cleaning device for the distribution cabinet filter as described in claim 3, characterized in that, The inner core (113) and the guide groove (104) of the drive mechanism form a guide limiting structure. During the movement of the cleaning head (101), the inner core (113) is limited and generates a reciprocating displacement along the axis of the cleaning head (101).

6. The self-cleaning device for the distribution cabinet filter as described in claim 5, characterized in that, The guide limiting structure includes limiting teeth (108) provided at the guide groove (104); One end of the inner core (113) is connected to the cleaning head (101) via an elastic element (116), and the other end extends to the outside of the cleaning body and abuts against the limiting teeth (108).

7. The self-cleaning device for the distribution cabinet filter as described in claim 6, characterized in that, The limiting tooth (108) and the guide groove (104) slide together. When the cleaning head (101) moves, the inner core (113) acts on the limiting tooth (108) so that the limiting tooth (108) is located at one end of the cleaning head (101) in the forward direction and abuts against the guide groove (104).

8. The self-cleaning device for the distribution cabinet filter as described in claim 1, characterized in that, The positive pressure assembly includes a fan or air pump, and a guide pipe (106) connected between the fan or air pump and the cleaning head (101).

9. The self-cleaning device for the distribution cabinet filter as described in claim 1, characterized in that, The driving mechanism is a linear push rod (102).

10. The self-cleaning device for the distribution cabinet filter as described in claim 2, characterized in that, The flexible seal (117) is made of rubber or felt.

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